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  <div class="section" id="module-fnmatch">
<span id="fnmatch-unix-filename-pattern-matching"></span><h1><a class="reference internal" href="#module-fnmatch" title="fnmatch: Unix shell style filename pattern matching."><code class="xref py py-mod docutils literal notranslate"><span class="pre">fnmatch</span></code></a> --- Unix 文件名模式匹配<a class="headerlink" href="#module-fnmatch" title="永久链接至标题">¶</a></h1>
<p><strong>源代码:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Lib/fnmatch.py">Lib/fnmatch.py</a></p>
<span class="target" id="index-0"></span><hr class="docutils" id="index-1" />
<p>此模块提供了 Unix shell 风格的通配符，它们 <em>并不</em> 等同于正则表达式（关于后者的文档参见 <a class="reference internal" href="re.html#module-re" title="re: Regular expression operations."><code class="xref py py-mod docutils literal notranslate"><span class="pre">re</span></code></a> 模块）。 shell 风格通配符所使用的特殊字符如下：</p>
<table class="docutils align-default" id="index-2">
<colgroup>
<col style="width: 25%" />
<col style="width: 75%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>模式</p></th>
<th class="head"><p>含义</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">*</span></code></p></td>
<td><p>匹配所有</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">?</span></code></p></td>
<td><p>匹配任何单个字符</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">[seq]</span></code></p></td>
<td><p>匹配 <em>seq</em> 中的任何字符</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">[!seq]</span></code></p></td>
<td><p>匹配任何不在 <em>seq</em> 中的字符</p></td>
</tr>
</tbody>
</table>
<p>对于字面值匹配，请将原字符用方括号括起来。 例如，<code class="docutils literal notranslate"><span class="pre">'[?]'</span></code> 将匹配字符 <code class="docutils literal notranslate"><span class="pre">'?'</span></code>。</p>
<p id="index-3">注意文件名分隔符 (Unix 上为 <code class="docutils literal notranslate"><span class="pre">'/'</span></code>) <em>不是</em> 此模块所特有的。 请参见 <a class="reference internal" href="glob.html#module-glob" title="glob: Unix shell style pathname pattern expansion."><code class="xref py py-mod docutils literal notranslate"><span class="pre">glob</span></code></a> 模块了解文件名扩展 (<a class="reference internal" href="glob.html#module-glob" title="glob: Unix shell style pathname pattern expansion."><code class="xref py py-mod docutils literal notranslate"><span class="pre">glob</span></code></a> 使用 <a class="reference internal" href="#fnmatch.filter" title="fnmatch.filter"><code class="xref py py-func docutils literal notranslate"><span class="pre">filter()</span></code></a> 来匹配文件名的各个部分)。 类似地，以一个句点打头的文件名也不是此模块所特有的，可以通过 <code class="docutils literal notranslate"><span class="pre">*</span></code> 和 <code class="docutils literal notranslate"><span class="pre">?</span></code> 模式来匹配。</p>
<dl class="function">
<dt id="fnmatch.fnmatch">
<code class="sig-prename descclassname">fnmatch.</code><code class="sig-name descname">fnmatch</code><span class="sig-paren">(</span><em class="sig-param">filename</em>, <em class="sig-param">pattern</em><span class="sig-paren">)</span><a class="headerlink" href="#fnmatch.fnmatch" title="永久链接至目标">¶</a></dt>
<dd><p>检测 <em>filename</em> 字符串是否匹配 <em>pattern</em> 字符串，返回 <a class="reference internal" href="constants.html#True" title="True"><code class="xref py py-const docutils literal notranslate"><span class="pre">True</span></code></a> 或 <a class="reference internal" href="constants.html#False" title="False"><code class="xref py py-const docutils literal notranslate"><span class="pre">False</span></code></a>。 两个形参都会使用 <a class="reference internal" href="os.path.html#os.path.normcase" title="os.path.normcase"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.path.normcase()</span></code></a> 进行大小写正规化。 <a class="reference internal" href="#fnmatch.fnmatchcase" title="fnmatch.fnmatchcase"><code class="xref py py-func docutils literal notranslate"><span class="pre">fnmatchcase()</span></code></a> 可被用于执行大小写敏感的比较，无论这是否为所在操作系统的标准。</p>
<p>这个例子将打印当前目录下带有扩展名 <code class="docutils literal notranslate"><span class="pre">.txt</span></code> 的所有文件名:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">fnmatch</span>
<span class="kn">import</span> <span class="nn">os</span>

<span class="k">for</span> <span class="n">file</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="s1">&#39;.&#39;</span><span class="p">):</span>
    <span class="k">if</span> <span class="n">fnmatch</span><span class="o">.</span><span class="n">fnmatch</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s1">&#39;*.txt&#39;</span><span class="p">):</span>
        <span class="nb">print</span><span class="p">(</span><span class="n">file</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>

<dl class="function">
<dt id="fnmatch.fnmatchcase">
<code class="sig-prename descclassname">fnmatch.</code><code class="sig-name descname">fnmatchcase</code><span class="sig-paren">(</span><em class="sig-param">filename</em>, <em class="sig-param">pattern</em><span class="sig-paren">)</span><a class="headerlink" href="#fnmatch.fnmatchcase" title="永久链接至目标">¶</a></dt>
<dd><p>检测 <em>filename</em> 是否匹配 <em>pattern</em>，返回 <a class="reference internal" href="constants.html#True" title="True"><code class="xref py py-const docutils literal notranslate"><span class="pre">True</span></code></a> 或 <a class="reference internal" href="constants.html#False" title="False"><code class="xref py py-const docutils literal notranslate"><span class="pre">False</span></code></a>；此比较是大小写敏感的，并且不会应用 <a class="reference internal" href="os.path.html#os.path.normcase" title="os.path.normcase"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.path.normcase()</span></code></a>。</p>
</dd></dl>

<dl class="function">
<dt id="fnmatch.filter">
<code class="sig-prename descclassname">fnmatch.</code><code class="sig-name descname">filter</code><span class="sig-paren">(</span><em class="sig-param">names</em>, <em class="sig-param">pattern</em><span class="sig-paren">)</span><a class="headerlink" href="#fnmatch.filter" title="永久链接至目标">¶</a></dt>
<dd><p>返回 <em>names</em> 列表中匹配 <em>pattern</em> 的子集。 它等价于 <code class="docutils literal notranslate"><span class="pre">[n</span> <span class="pre">for</span> <span class="pre">n</span> <span class="pre">in</span> <span class="pre">names</span> <span class="pre">if</span> <span class="pre">fnmatch(n,</span> <span class="pre">pattern)]</span></code>，但其实现更为高效。</p>
</dd></dl>

<dl class="function">
<dt id="fnmatch.translate">
<code class="sig-prename descclassname">fnmatch.</code><code class="sig-name descname">translate</code><span class="sig-paren">(</span><em class="sig-param">pattern</em><span class="sig-paren">)</span><a class="headerlink" href="#fnmatch.translate" title="永久链接至目标">¶</a></dt>
<dd><p>返回 shell 风格 <em>pattern</em> 转换成的正则表达式以便用于 <a class="reference internal" href="re.html#re.match" title="re.match"><code class="xref py py-func docutils literal notranslate"><span class="pre">re.match()</span></code></a>。</p>
<p>示例:</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">fnmatch</span><span class="o">,</span> <span class="nn">re</span>
<span class="go">&gt;&gt;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">regex</span> <span class="o">=</span> <span class="n">fnmatch</span><span class="o">.</span><span class="n">translate</span><span class="p">(</span><span class="s1">&#39;*.txt&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">regex</span>
<span class="go">&#39;(?s:.*\\.txt)\\Z&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">reobj</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="n">regex</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">reobj</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="s1">&#39;foobar.txt&#39;</span><span class="p">)</span>
<span class="go">&lt;re.Match object; span=(0, 10), match=&#39;foobar.txt&#39;&gt;</span>
</pre></div>
</div>
</dd></dl>

<div class="admonition seealso">
<p class="admonition-title">参见</p>
<dl class="simple">
<dt>模块 <a class="reference internal" href="glob.html#module-glob" title="glob: Unix shell style pathname pattern expansion."><code class="xref py py-mod docutils literal notranslate"><span class="pre">glob</span></code></a></dt><dd><p>Unix shell 风格路径扩展。</p>
</dd>
</dl>
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